// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_BASE_NETWORK_CHANGE_NOTIFIER_MAC_H_
#define NET_BASE_NETWORK_CHANGE_NOTIFIER_MAC_H_

#include <SystemConfiguration/SystemConfiguration.h>

#include <memory>

#include "base/compiler_specific.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/macros.h"
#include "base/synchronization/condition_variable.h"
#include "base/synchronization/lock.h"
#include "net/base/network_change_notifier.h"
#include "net/base/network_config_watcher_mac.h"

namespace net {

class NetworkChangeNotifierMac : public NetworkChangeNotifier {
public:
    NetworkChangeNotifierMac();
    ~NetworkChangeNotifierMac() override;

    // NetworkChangeNotifier implementation:
    ConnectionType GetCurrentConnectionType() const override;

    // Forwarder just exists to keep the NetworkConfigWatcherMac API out of
    // NetworkChangeNotifierMac's public API.
    class Forwarder : public NetworkConfigWatcherMac::Delegate {
    public:
        explicit Forwarder(NetworkChangeNotifierMac* net_config_watcher)
            : net_config_watcher_(net_config_watcher)
        {
        }

        // NetworkConfigWatcherMac::Delegate implementation:
        void Init() override;
        void StartReachabilityNotifications() override;
        void SetDynamicStoreNotificationKeys(SCDynamicStoreRef store) override;
        void OnNetworkConfigChange(CFArrayRef changed_keys) override;

    private:
        NetworkChangeNotifierMac* const net_config_watcher_;
        DISALLOW_COPY_AND_ASSIGN(Forwarder);
    };

private:
    class DnsConfigServiceThread;

    // Methods directly called by the NetworkConfigWatcherMac::Delegate:
    void StartReachabilityNotifications();
    void SetDynamicStoreNotificationKeys(SCDynamicStoreRef store);
    void OnNetworkConfigChange(CFArrayRef changed_keys);

    void SetInitialConnectionType();

    static void ReachabilityCallback(SCNetworkReachabilityRef target,
        SCNetworkConnectionFlags flags,
        void* notifier);

    static NetworkChangeCalculatorParams NetworkChangeCalculatorParamsMac();

    // These must be constructed before config_watcher_ to ensure
    // the lock is in a valid state when Forwarder::Init is called.
    ConnectionType connection_type_;
    bool connection_type_initialized_;
    mutable base::Lock connection_type_lock_;
    mutable base::ConditionVariable initial_connection_type_cv_;
    base::ScopedCFTypeRef<SCNetworkReachabilityRef> reachability_;
    base::ScopedCFTypeRef<CFRunLoopRef> run_loop_;

    Forwarder forwarder_;
    std::unique_ptr<const NetworkConfigWatcherMac> config_watcher_;

    std::unique_ptr<DnsConfigServiceThread> dns_config_service_thread_;

    DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifierMac);
};

} // namespace net

#endif // NET_BASE_NETWORK_CHANGE_NOTIFIER_MAC_H_
